BPD bipolar or BPD borderline personality disorder? The latter is a weird catch-all diagnosis that's just plain vague and starting to be seen as unhelpful. Bipolar is quite treatable, but honestly I think someone would have noticed by now, you have seen some therapists and services.
You should probably talk with your therapist about this. I think the way you were treated as a child is in itself enough to undermine and scare a child into this kind of thinking, and when stressed we often go to the vulnerable places in us.
I guess normal is just the way a majority are. It's not always better than not normal... For a child to make sense of abuse, they will have had to take some strange paths. Usually children conclude that they are wrong and bad in various ways, because the idea that the abuser is the bad one is hard to understand and if the person or people are family members, it's usually too frightening and upsetting.
The way you feel made a kind of sense of something impossible for a child to make sense of. I expect you have discussed this already in therapy, but it's pretty difficult stuff. Children survive through making sense of things and finding ways to cope. This isn't madness, it's all they can do. But afterwards it's confusing.
The way your ex has acted and the way it's hard to keep in touch at this time with friends , has triggered your abandonment issues, understandably. At such times any of us go to our most insecure thoughts, it's too hard not to. But it's ok to be angry with him, and not yourself. He let you down.
I hope you have some plans for the weekend? A stroll out, or time with an absorbing interest, or something you enjoy? Every day feels similar at present I think, it's an odd time.